package com.itheima.reggie_1.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie_1.common.R;
import com.itheima.reggie_1.dto.DishDto;
import com.itheima.reggie_1.entity.Category;
import com.itheima.reggie_1.entity.Dish;
import com.itheima.reggie_1.entity.DishFlavor;
import com.itheima.reggie_1.service.CategoryService;
import com.itheima.reggie_1.service.DishFlavorService;
import com.itheima.reggie_1.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@Slf4j
@RestController
@RequestMapping("/dish")
public class DishController {
    @Autowired
    private DishService dishService;
    @Autowired
    private DishFlavorService dishFlavorService;
    @Autowired
    private CategoryService categoryService;
    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());
        dishService.saveWithFlavor(dishDto);

//        清理所有的菜品缓存数据
//        Set keys = redisTemplate.keys("dish_*");
//        redisTemplate.delete(keys);

//        清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<IPage> page(Integer page, Integer pageSize, String name) {
        IPage<DishDto> pageInfo = dishService.selectByPage(page, pageSize, name);
        return R.success(pageInfo);
    }
   /* @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {
//        构造分页构造器对象
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>();// {total:50,records:[{dishDto},{},{}]}
//        条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
//        添加过滤条件 where name like '%zs%'
        queryWrapper.like(name != null, Dish::getName,name);
//        添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);
//        执行分页查询    生成2条sql语句 select count(*) from dish select * from dish limit
        dishService.page(pageInfo,queryWrapper);//  pageInfo = {"records":[{dish},{}],"total":12,currentPage:1}
//        对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);
            Long categoryId = item.getCategoryId();// 分类id
//            根据id查询分类对象    where id = ?
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);//    {dish,categoryName:"湘菜"}
            }
            return dishDto;
        }).collect(Collectors.toList());
        dishDtoPage.setRecords(list);
        return R.success(dishDtoPage);
    }*/

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return  /dish/223435345
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }

    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());
        dishService.updateWithFlavor(dishDto);

//        清理所有的菜品缓存数据
//        Set keys = redisTemplate.keys("dish_*");
//        redisTemplate.delete(keys);

//        清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    /**
     * 根据条件查询对应的菜品数据
     * @param dish
     * @return
     */
    @GetMapping("/list")
    @Cacheable(value = "dishCache",key = "#dish.categoryId + '_' + #dish.status")
    public R<List<DishDto>> list(Dish dish) {
        List<DishDto> dishDtoList = null;
//        动态构造key
//        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();
////        先从redis中获取缓存数据
//        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
//        if (dishDtoList != null) {
////        如果存在,直接返回,无需查询数据库
//            return R.success(dishDtoList);
//        }
//        构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null,Dish::getCategoryId,dish.getCategoryId());
//        添加条件,查询状态为1(起售状态)的菜品
        queryWrapper.eq(Dish::getStatus,1);
//        添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);
        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//   分类id
//            根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

//            当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
//            SQL:select * from dish_flavor where dish_id
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);
            return dishDto;
        }).collect(Collectors.toList());
//        如果不存在,需要查询数据库,将查询到的菜品数据缓存到Redis
//        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);
        return R.success(dishDtoList);
    }
}
